Half to william henry dittmar



(No Model.) 2 Sheetsi-Sheet 1.

" PJJ. JUDD.

I PULVERIZING MILL. No. 522,377. PatentedJuly 3, 1894.1

621222927 I flwfiw mk 5 (No Mode-1.) 2 Sheet-Sheet 2/ P. J-. JUD D.PULVERIZIN'G MILL N0. 522,377. Patented July 3, 1894;.

Y": NdRRxs Fcrzns 00., "momma" WASHINGTON: 04 c .i UNIT D STATES PATENT.OFFICE.

FRED JUNIUS JUDD, OF JERSEY CITY, NEW JERSEY, ASSIGNOR OF ONE- HALF TOWILLIAM HENRY DITTMAR, OF SAME PLACE.

PUI\ V'ERIVZING-'-MILL.

SPECIFICATION forming part of Letters Eatent No. 522,377, dated July 3,1894. Application filed July 11,1893. sale No. 480.133. (No model.)

To all whom it may concern.-

Be it known that I, FRED J UNIUS J UDD, of

Jersey City, in the county of Hudson and State of New Jersey, haveinvented a certain new and useful Improvement in Pulverizing- Mills, ofwhich the following is a specification.

I will describe a mill embodying my improvement in detail and then pointout the novel features in the claims.

In the accompanyingdrawings Figure l'is a central vertical section of apulverizin g mill embodying my improvement and Fig. 2 is a top view of amodified form of the same, parts of the interior being shown in dottedoutline.

Similar letters of reference designate corresponding parts in bothfigures.

A designates a casing in which is contained an open spring B. Arod 0passes into the casing A and through the spring B. The spring B rests atone end against the side a of the casing while at the other end it restsagainst a head on the'rod O. p

G designates another rod also passing into the casing A and having ahead which rests against the inner side of the end a of the casing.

The rods C O are bolted at the opposite ends to those which enter thecasing A, to the shafts D. These shafts D are made hollow as shown at Zso that oil or other lubricatin agent may be passed through them.

.said flanges G, rolls H and lower plate together.

The shafts D have one or more holes (1 1n those portions of said shaftsaround which the rolls H revolve. These holes (1 permit the escape ofthe lubricating material which is fed through the shafts D. On thebottoms of the shafts D are collars h for holding the rolls H in place.

F designates the outer casing of the mill.

Bolted to this casing F is a plate I tapered at I and in this taperedportion is fitted a box I for taking up the wear of the main shaft J ofthe mill. 1

To the main shaft J is fitted the bevel gear wheel K which intermesheswith the bevel gear wheel K mounted on the shaft K which is connected bybelting or otherwise with the pen to any portion of the screenthedamaged portion may be repaired without removing the entire screen.

5 Fasten'ed to the upperend of the screen 0 is a metal ring or band Pagainst which press I scrapers Q fastened to the cover F.

I will now describe the operation of the mill. The motive power beingapplied the shaft K will revolve, revolving with it the bevel gear wheelK and the intermeshing bevel gear wheel K. This will cause the rotationof the main shaft J. The motion of the main shaft J revolves the pan Lcontaining the material which it is desired to pulverize, and as the panL revolves the rollsjH will be caused to revolve also. The material inthe pan passing between the rolls H and the ring M will be pulverized,and this pulverized material will be caused to fiy upward against thescreen 0 by the centrifugal force generated by the motion of the pan Land the rolls H. If the material has been pulverizedsufficiently it willpass through the-screen and fall into the trough R and be gatheredtogether by the scraper S affixed to the outside of the pan anddischarged through a hopper suitably arranged. A lug i on the plate Iprevents the pulverized material from getting under the pan L andchoking it. In addition the fans N will create a current of air to throwthe dust away from the main bearing. Should any material reach the metalband P the scrapers R will throw it back into :00

the pan. Underneath the rolls H I have ar ranged agitators T forstirring up any material which may stick.

By my improvement I produce a pulverizing mill of great simplicity andstrength. The shafts D being hollow permit of lubricating material beingfreely supplied to the rolls, and as the rolls are held against the sideof the pan by means of a spring B it is evident that there is not muchdanger of causing damage to the mill by the operation of grinding. Thewear on the pan in the operation of grinding falls on the metal ring Mwhich may at pleasure be removed and re-* placed by another ring.

In Fig. 2 I have shown four rolls applied. Indeed any desired number ofrolls may be employed.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a pulverizing machine, the combination of non-revolving hollowshafts, trunnion boxes therefor,sleevessurroundingsaid shafts below theboxes, rolls secured to the sleeves, holes in the lower parts of saidshafts,means for drawing the upper ends of said shafts to ward eachother, a pan in which the rolls work, a screen arranged above said pan,a circular band above said screen, a scraper in contact with said band,a trough surrounding the screen, a scraper arranged on the outer side ofthe pan, fans arranged underneath the pan and means for revolving thepan,substantially as specified.

2. In a grinding mill the combination with an external casing having abearing at its bottom, a partition arranged horizontally above thebearing and provided with a corresponding central opening, an annularflange arranged upon the upper side of the parti tion and encircling theopening, and a cylinder arranged upon said partition and en circling theflange, said partition having an opening between the flange andcylinder, of a revoluble pan located in the cylinder above the partitionand provided with a peripheral depending flange taking over that of thepartition and having an upper perforate wall, a vertical shaft arrangedin the bearing of the casing and passing through the opening in thepartition and supporting the pan, means for revolving the shaft,vertical shafts arranged in the upper end of the casin g and dependinginto the pan, loose rollers arranged on the lower ends of said shafts,and means for pressing the rollers against the wall of the pan,substanti lly as specified.

3. In a grinding mill the combination with an external casing having abearing at its bottom, a partition arranged horizontally above thebearing and provided with a central corresponding opening, an annularflange arranged upon the upper sideof the partition andencirclingtheopening,andacylinderarranged upon said partition andencircling the flange, said partition having an opening between theflange and central opening therein, of a revoluble pan located in thecylinder and provided with a peripheral depending flange taking overthat of the partition and having an upper perforate wall, avertical'shaft arranged in the bearing of the casing and passing throughthe opening in the partition and supporting the pan, means for revolvingthe shaft, vertical shafts arranged in the upper end of the casing anddepending into the pan, loose rollers arranged on the lower ends of saidshafts, and means for pressing the rollers against the wall of the pan,perforations formed in the partition and fans arranged on the under sideof the pan over the perforations, substantially as specified.

FRED JUNIUS JUDD.

Witnesses:

J. R. BOWEN, MATTHEW BOWEN.

